-Time-stamp: <2006-05-04 20:39:17 blp>
-
-Procedure processing:
-
-* Should not need temporary casefile in the common case.
-
-* All of the procedure_*() variants can (and should) be implemented in terms of
- a variant that provides "proc_func" plus an "end_func" called after all
- processing is complete.
-
-* The "split" variants should not dump the splits to the output file
- automatically. There is no need for the procedure code to talk to the output
- manager.
-
-* LAG need not be as much of a special case.
-
-* Change sources into state machines?
+Time-stamp: <2006-12-17 18:45:35 blp>
Get rid of need for GNU diff in `make check'.
-Format specifier code needs to be rewritten for lowered crappiness.
-
CROSSTABS needs to be re-examined.
-RANK, which is needed for the Wilcoxon signed-rank statistic, Mann-Whitney U,
-Kruskal-Wallis on NPAR TESTS and for Spearman and the Johnkheere trend test (in
-other procedures).
-
-Add NOT_REACHED() macro.
-
Scratch variables should not be available for use following TEMPORARY.
Check our results against the NIST StRD benchmark results at
OTOH, if the /TABLE is too large, then do it the old way, complaining if either
file is not sorted on key.
-----------------------------------------------------------------------
-Statistical procedures:
-
-For each case we read from the input program:
-
-1. Execute permanent transformations. If these drop the case, stop.
-2. N OF CASES. If we have already written N cases, stop.
-3. Write case to replacement active file.
-4. Execute temporary transformations. If these drop the case, stop.
-5. Post-TEMPORARY N OF CASES. If we have already analyzed N cases, stop.
-6. FILTER, PROCESS IF. If these drop the case, stop.
-7. Pass case to procedure.
-
-Ugly cases:
-
-LAG records cases in step 3.
-
-AGGREGATE: When output goes to an external file, this is just an ordinary
-procedure. When output goes to the active file, step 3 should be skipped,
-because AGGREGATE creates its own case sink and writes to it in step 7. Also,
-TEMPORARY has no effect and we just cancel it. Regardless of direction of
-output, we should not implement AGGREGATE through a transformation because that
-will fail to honor FILTER, PROCESS IF, N OF CASES.
-
-ADD FILES: Essentially an input program. It silently cancels unclosed LOOPs
-and DO IFs. If the active file is used for input, then runs EXECUTE (if there
-are any transformations) and then steals vfm_source and encapsulates it. If
-the active file is not used for input, then it cancels all the transformations
-and deletes the original active file.
-
-CASESTOVARS: ???
-
-FLIP:
-
-MATCH FILES: Similar to AGGREGATE. This is a procedure. When the active file
-is used for input, it reads the active file; otherwise, it just cancels all the
-transformations and deletes the original active file. Step 3 should be
-skipped, because MATCH FILES creates its own case sink and writes to it in step
-7. TEMPORARY is not allowed.
-
-MODIFY VARS:
-
-REPEATING DATA:
-
-SORT CASES:
-
-UPDATE: same as ADD FILES.
-
-VARSTOCASES: ???
-----------------------------------------------------------------------
-N OF CASES
-
- * Before TEMPORARY, limits number of cases sent to the sink.
-
- * After TEMPORARY, limits number of cases sent to the procedure.
-
- * Without TEMPORARY, those are the same cases, so it limits both.
-
-SAMPLE
-
- * Sample is just a transformation. It has no special properties.
-
-FILTER
-
- * Always selects cases sent to the procedure.
-
- * No effect on cases sent to sink.
-
- * Before TEMPORARY, selection is permanent. After TEMPORARY,
- selection stops after a procedure.
-
-PROCESS IF
-
- * Always selects cases sent to the procedure.
-
- * No effect on cases sent to sink.
-
- * Always stops after a procedure.
-
-SPLIT FILE
-
- * Ignored by AGGREGATE. Used when procedures write matrices.
-
- * Always applies to the procedure.
-
- * Before TEMPORARY, splitting is permanent. After TEMPORARY,
- splitting stops after a procedure.
-
-TEMPORARY
-
- * TEMPORARY has no effect on AGGREGATE when output goes to the active file.
-
- * SORT CASES, ADD FILES, RENAME VARIABLES, CASESTOVARS, VARSTOCASES,
- COMPUTE with a lag function cannot be used after TEMPORARY.
-
- * Cannot be used in DO IF...END IF or LOOP...END LOOP.
-
- * FLIP ignores TEMPORARY. All transformations become permanent.
-
- * MATCH FILES and UPDATE cannot be used after TEMPORARY if active
- file is an input source.
-
- * RENAME VARIABLES is invalid after TEMPORARY.
-
- * WEIGHT, SPLIT FILE, N OF CASES, FILTER, PROCESS IF apply only to
- the next procedure when used after TEMPORARY.
-
-WEIGHT
-
- * Always applies to the procedure.
-
- * Before TEMPORARY, weighting is permanent. After TEMPORARY,
- weighting stops after a procedure.
-
-
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